1 files changed, 17 insertions, 1 deletions
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
index 0aadfbcd5991..98b22a7b18bd 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
@@ -11,15 +11,31 @@
 
 // duration
 
-// duration& operator--();
+// constexpr duration& operator--();  // constexpr in C++17
 
 #include <chrono>
 #include <cassert>
 
+#include "test_macros.h"
+
+#if TEST_STD_VER > 14
+constexpr bool test_constexpr()
+{
+    std::chrono::hours h(3);
+    return (--h).count() == 2;
+}
+#endif
+
 int main()
 {
+    {
     std::chrono::hours h(3);
     std::chrono::hours& href = --h;
     assert(&href == &h);
     assert(h.count() == 2);
+    }
+
+#if TEST_STD_VER > 14
+    static_assert(test_constexpr(), "");
+#endif
 }